The Role of Laser Field Effect on Thermo-Spin Transport Properties through Serially Coupled Quantum Dots System

Abstract

 The effect of laser field in thermospin properties through one of the most elaborate hybrid serially configuration coupled quantum dots system is investigated. The non-equilibrium Green function and the two impurity Anderson model are utilized in this study to model the DQD that coupled strongly with the normal metallic electrodes to enable the spin transport process in the case of linear response regime. Based on the probability function variation with energy and by using Taylor expansion, an analytical formulation was derived to evaluate the occupation numbers on each
quantum dot, the occupation numbers are used to evaluate the spin currents and the differential conductance. The calculations declare the coupling interaction ( V12 ) increases and the total spin current become enhanced and the spin differential conductance show tow splitting peaks separated by conductance gab which reflects the Pauli-spin blockade, the energy spacing between slitting peaks is equal to the value of the coupling interaction (V12 ). As the value of ( V12 ) increases the spin conductance gab decreases. When the laser field interact with quantum dots, the
spin differential conductance enhances and induces the photon-assisted (FAT) peaks in differential conductance spectrum. An interesting results is the observation of photon-assisted (FAT) peak that can be emerged in the Paulispin blockade effects around ( u  0 ) region especially when V12 =hw= 0.04eV .